:root{
  --desk: #171A21;
  --desk-2: #1D212A;
  --paper: #F4EFE2;
  --paper-2: #ECE5D3;
  --ink: #22252B;
  --ink-soft: #55524a;
  --seal: #8E2F2B;
  --seal-dark: #6E2320;
  --brass: #B8863B;
  --brass-light: #D8B876;
  --teal: #3F5A5A;
  --line: rgba(34,37,43,0.14);
  --shadow: 0 30px 60px -20px rgba(0,0,0,0.55);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:
    radial-gradient(ellipse 900px 500px at 20% -10%, rgba(184,134,59,0.10), transparent 60%),
    radial-gradient(ellipse 700px 600px at 100% 10%, rgba(142,47,43,0.08), transparent 55%),
    var(--desk);
  color: var(--paper);
  font-family: 'Inter', sans-serif;
  min-height:100vh;
  -webkit-font-smoothing: antialiased;
}
::selection{ background: var(--brass); color: var(--desk); }

body::before{
  content:"";
  position:fixed; inset:0;
  background-image: repeating-linear-gradient(0deg, rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px, transparent 1px, transparent 3px);
  pointer-events:none;
  z-index:0;
}

.wrap{
  position:relative; z-index:1;
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 28px 90px;
}

header.top{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap: 24px; margin-bottom: 44px; flex-wrap: wrap;
}
.wordmark{
  font-family:'Fraunces', serif;
  font-weight:600;
  font-size: clamp(40px, 6vw, 58px);
  letter-spacing: -0.02em;
  color: var(--paper);
  display:flex; align-items:baseline; gap:14px;
}
.wordmark .dot{ color: var(--seal); font-size: 0.6em; }
.tagline{
  font-family:'IBM Plex Mono', monospace;
  font-size:13px;
  letter-spacing:0.06em;
  text-transform: uppercase;
  color: var(--brass-light);
  max-width: 320px;
  text-align:right;
  line-height:1.6;
  opacity:0.9;
}

.stage{
  display:grid;
  grid-template-columns: minmax(320px, 460px) 1fr;
  gap: 34px;
  align-items:start;
}
@media (max-width: 900px){
  .stage{ grid-template-columns: 1fr; }
}

/* ---- Paper card (form) ---- */
.letter-card{
  background: var(--paper);
  color: var(--ink);
  border-radius: 3px;
  box-shadow: var(--shadow);
  position:relative;
  padding: 38px 34px 34px;
  background-image:
    linear-gradient(var(--paper), var(--paper)),
    repeating-linear-gradient(180deg, transparent 0 27px, rgba(34,37,43,0.05) 27px 28px);
}
.letter-card::before{
  content:"";
  position:absolute; top:-1px; left:0; right:0; height:10px;
  background: repeating-linear-gradient(115deg, var(--desk) 0 6px, transparent 6px 12px);
  opacity:0.9;
}
.letterhead{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color: var(--ink-soft);
  display:flex; justify-content:space-between;
  border-bottom: 1px solid var(--line);
  padding-bottom:14px;
  margin-bottom:22px;
}

.field{ margin-bottom:18px; }
.field label{
  display:block;
  font-family:'IBM Plex Mono', monospace;
  font-size:11.5px;
  letter-spacing:0.05em;
  text-transform:uppercase;
  color: var(--ink-soft);
  margin-bottom:7px;
}
.field .hint{
  font-family:'Inter';
  text-transform:none;
  letter-spacing:0;
  color: rgba(85,82,74,0.65);
  font-size:11.5px;
  margin-left:6px;
}
input[type=text], textarea, select{
  width:100%;
  background: rgba(255,255,255,0.5);
  border: 1px solid rgba(34,37,43,0.22);
  border-radius: 2px;
  padding: 11px 12px;
  font-family:'Inter', sans-serif;
  font-size:14.5px;
  color: var(--ink);
  resize: vertical;
  transition: border-color .15s ease, background .15s ease, box-shadow .15s ease;
}
input[type=text]::placeholder, textarea::placeholder{ color: rgba(85,82,74,0.55); }
input[type=text]:focus, textarea:focus, select:focus{
  outline:none;
  border-color: var(--brass);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(184,134,59,0.18);
}
textarea{ min-height: 84px; line-height:1.5; }
select{ appearance:none; -webkit-appearance:none; cursor:pointer;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8'><path d='M1 1l5 5 5-5' stroke='%2355524a' stroke-width='1.5' fill='none' fill-rule='evenodd'/></svg>");
  background-repeat:no-repeat; background-position: right 12px center;
  padding-right: 34px;
}

.two-col{ display:grid; grid-template-columns: 1fr 1fr; gap:14px; }
@media (max-width:520px){ .two-col{ grid-template-columns: 1fr; } }

.tone-row{ display:flex; gap:8px; flex-wrap:wrap; }
.tone-tag{
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  letter-spacing:0.03em;
  padding: 8px 14px;
  border: 1px solid rgba(34,37,43,0.25);
  border-radius: 2px;
  cursor:pointer;
  color: var(--ink-soft);
  background: rgba(255,255,255,0.35);
  transition: all .15s ease;
  user-select:none;
}
.tone-tag:hover{ border-color: var(--teal); color: var(--ink); }
.tone-tag.active{
  background: var(--teal);
  border-color: var(--teal);
  color: #F4EFE2;
}

.seal-row{ display:flex; align-items:center; gap:18px; margin-top:26px; }
.seal-btn{
  --size: 84px;
  width: var(--size); height: var(--size);
  border-radius:50%;
  border:none;
  cursor:pointer;
  position:relative;
  background:
    radial-gradient(circle at 35% 30%, #b0403a, var(--seal) 55%, var(--seal-dark) 100%);
  box-shadow: 0 8px 18px rgba(142,47,43,0.45), inset 0 -6px 10px rgba(0,0,0,0.25), inset 0 4px 8px rgba(255,255,255,0.15);
  flex: none;
  transition: transform .12s ease;
}
.seal-btn:active{ transform: scale(0.94); }
.seal-btn:disabled{ cursor:not-allowed; filter:saturate(0.6); opacity:0.75; }
.seal-btn .glyph{
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  font-family:'Fraunces', serif; font-weight:600; font-size:26px; color: rgba(244,239,226,0.92);
  letter-spacing:-0.02em;
}
.seal-btn.stamping{ animation: stampPress 0.55s ease; }
@keyframes stampPress{
  0%{ transform: translateY(-3px) scale(1); }
  35%{ transform: translateY(4px) scale(0.9); }
  60%{ transform: translateY(0) scale(1.04); }
  100%{ transform: translateY(0) scale(1); }
}
.seal-caption{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px;
  color: var(--ink-soft);
  line-height:1.5;
}
.seal-caption strong{ color: var(--ink); display:block; font-size:13px; margin-bottom:2px;}

.error-msg{
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  color: var(--seal);
  margin-top:14px;
  border-left: 2px solid var(--seal);
  padding-left:10px;
  display:none;
  line-height:1.5;
}
.error-msg.show{ display:block; }

/* ---- Right: output / letter result ---- */
.result-pane{ min-height: 520px; position:relative; }
.empty-state{
  height:100%;
  min-height:520px;
  border: 1px dashed rgba(244,239,226,0.22);
  border-radius: 4px;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  text-align:center; gap:16px;
  padding: 40px;
  color: rgba(244,239,226,0.55);
}
.empty-state.hidden{ display:none; }
.empty-state .seal-outline{
  width:64px; height:64px; border-radius:50%;
  border: 2px solid rgba(184,134,59,0.5);
  display:flex; align-items:center; justify-content:center;
  font-family:'Fraunces', serif; font-size:22px; color: var(--brass-light);
}
.empty-state p{ font-family:'IBM Plex Mono', monospace; font-size:12.5px; max-width:280px; line-height:1.7; letter-spacing:0.02em; }

.result-letter{
  display:none;
  background: var(--paper);
  color: var(--ink);
  border-radius: 3px;
  box-shadow: var(--shadow);
  padding: 0;
  overflow:hidden;
  animation: riseIn .4s cubic-bezier(.2,.7,.2,1);
}
.result-letter.show{ display:block; }
@keyframes riseIn{
  from{ opacity:0; transform: translateY(16px); }
  to{ opacity:1; transform: translateY(0); }
}

.postmark{
  display:flex; align-items:center; justify-content:space-between;
  background: var(--desk-2);
  color: var(--brass-light);
  padding: 14px 28px;
  font-family:'IBM Plex Mono', monospace;
  font-size:11.5px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  border-bottom: 3px double var(--brass);
}
.postmark .stamp-circle{
  width:34px; height:34px; border-radius:50%;
  border:1.5px solid var(--brass);
  display:flex; align-items:center; justify-content:center;
  font-family:'Fraunces', serif; font-size:14px; text-transform:none; letter-spacing:0;
}

.letter-body-wrap{ padding: 30px 34px 34px; }
.subject-line{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px; text-transform:uppercase; letter-spacing:0.08em; color: var(--ink-soft);
  margin-bottom:6px;
}
.subject-text{
  font-family:'Fraunces', serif;
  font-size: 24px;
  font-weight:600;
  color: var(--ink);
  margin: 0 0 22px;
  padding-bottom:18px;
  border-bottom: 1px solid var(--line);
  letter-spacing:-0.01em;
  min-height: 1.3em;
}
.body-text{
  font-family:'Inter', sans-serif;
  font-size:15px;
  line-height:1.75;
  color: var(--ink);
  white-space: pre-wrap;
  min-height: 120px;
}

/* streaming cursor */
.cursor{
  display:inline-block;
  width: 2px;
  height: 1em;
  background: var(--seal);
  margin-left: 2px;
  vertical-align: -0.15em;
  animation: blink 0.9s step-start infinite;
}
.cursor.hidden{ display:none; }
@keyframes blink{ 50%{ opacity:0; } }

.actions-row{
  display:flex; gap:10px; margin-top:28px; flex-wrap:wrap;
  padding-top:20px; border-top: 1px dashed var(--line);
}
.btn{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px; letter-spacing:0.04em; text-transform:uppercase;
  padding: 10px 16px;
  border-radius:2px;
  cursor:pointer;
  border: 1px solid rgba(34,37,43,0.25);
  background: transparent;
  color: var(--ink);
  transition: all .15s ease;
  display:flex; align-items:center; gap:8px;
}
.btn:hover{ border-color: var(--teal); background: rgba(63,90,90,0.08); }
.btn:disabled{ opacity:0.5; cursor:not-allowed; }
.btn.primary{
  background: var(--teal); border-color: var(--teal); color: #F4EFE2;
}
.btn.primary:hover{ background:#374f4f; }
.btn.copied{ border-color: var(--seal); color: var(--seal); }
.btn.copy-failed{ border-color: var(--seal); color: var(--seal); }

footer.foot{
  text-align:center;
  margin-top: 60px;
  font-family:'IBM Plex Mono', monospace;
  font-size:11px;
  letter-spacing:0.06em;
  color: rgba(244,239,226,0.35);
  text-transform:uppercase;
}

@media (prefers-reduced-motion: reduce){
  .seal-btn.stamping, .result-letter, .cursor{ animation: none !important; }
}